Pentium III 1266S vs i5-660
Primary details
Comparing Core i5-660 and Pentium III 1266S processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 2135 | not rated |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | 0.10 | no data |
| Market segment | Desktop processor | Desktop processor |
| Power efficiency | 1.95 | no data |
| Architecture codename | Clarkdale (2010−2011) | Tualatin (2000−2002) |
| Release date | 7 January 2010 (14 years ago) | July 2001 (23 years ago) |
| Launch price (MSRP) | $70 | no data |
Cost-effectiveness evaluation
Performance per price, higher is better.
Detailed specifications
Core i5-660 and Pentium III 1266S basic parameters such as number of cores, number of threads, base frequency and turbo boost clock, lithography, cache size and multiplier lock state. These parameters indirectly say of CPU speed, though for more precise assessment you have to consider their test results.
| Physical cores | 2 (Dual-core) | 1 (Single-Core) |
| Threads | 4 | 1 |
| Base clock speed | 3.33 GHz | no data |
| Boost clock speed | 3.6 GHz | 1.27 GHz |
| Bus rate | 2.5 GT/s | no data |
| L1 cache | 64 KB (per core) | 8 KB |
| L2 cache | 256 KB (per core) | 512 KB |
| L3 cache | 4 MB (shared) | 0 KB |
| Chip lithography | 32 nm | 130 nm |
| Die size | 81 mm2 | 80 mm2 |
| Maximum core temperature | 73 °C | no data |
| Maximum case temperature (TCase) | no data | 69 °C |
| Number of transistors | 382 million | 44 million |
| 64 bit support | + | - |
| Windows 11 compatibility | - | - |
Compatibility
Information on Core i5-660 and Pentium III 1266S compatibility with other computer components: motherboard (look for socket type), power supply unit (look for power consumption) etc. Useful when planning a future computer configuration or upgrading an existing one. Note that power consumption of some processors can well exceed their nominal TDP, even without overclocking. Some can even double their declared thermals given that the motherboard allows to tune the CPU power parameters.
| Number of CPUs in a configuration | 1 | 1 |
| Socket | FCLGA1156 | 370 |
| Power consumption (TDP) | 73 Watt | 30 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Core i5-660 and Pentium III 1266S. You'll probably need this information if you require some particular technology.
| Instruction set extensions | Intel® SSE4.2 | no data |
| AES-NI | + | - |
| Enhanced SpeedStep (EIST) | + | no data |
| Turbo Boost Technology | 1.0 | no data |
| Hyper-Threading Technology | + | no data |
| Idle States | + | no data |
| Demand Based Switching | - | no data |
| PAE | 36 Bit | no data |
| FDI | + | no data |
Security technologies
Core i5-660 and Pentium III 1266S technologies aimed at improving security, for example, by protecting against hacks.
| TXT | + | no data |
| EDB | + | no data |
Virtualization technologies
Virtual machine speed-up technologies supported by Core i5-660 and Pentium III 1266S are enumerated here.
| VT-d | + | no data |
| VT-x | + | no data |
| EPT | + | no data |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Core i5-660 and Pentium III 1266S. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR3 | no data |
| Maximum memory size | 16.38 GB | no data |
| Max memory channels | 2 | no data |
| Maximum memory bandwidth | 21 GB/s | no data |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | Intel® HD Graphics for Previous Generation Intel® Processors | no data |
| Clear Video HD | + | no data |
Graphics interfaces
Available interfaces and connections of Core i5-660 and Pentium III 1266S integrated GPUs.
| Number of displays supported | 2 | no data |
Peripherals
Specifications and connection of peripherals supported by Core i5-660 and Pentium III 1266S.
| PCIe version | 2.0 | no data |
| PCI Express lanes | 16 | no data |
Synthetic benchmark performance
Various benchmark results of the processors in comparison. Overall score is measured in points in 0-100 range, higher is better.
Passmark
Passmark CPU Mark is a widespread benchmark, consisting of 8 different types of workload, including integer and floating point math, extended instructions, compression, encryption and physics calculation. There is also one separate single-threaded scenario measuring single-core performance.
Pros & cons summary
| Physical cores | 2 | 1 |
| Threads | 4 | 1 |
| Chip lithography | 32 nm | 130 nm |
| Power consumption (TDP) | 73 Watt | 30 Watt |
i5-660 has 100% more physical cores and 300% more threads, and a 306.3% more advanced lithography process.
Pentium III 1266S, on the other hand, has 143.3% lower power consumption.
We couldn't decide between Core i5-660 and Pentium III 1266S. We've got no test results to judge.
Should you still have questions on choice between Core i5-660 and Pentium III 1266S, ask them in Comments section, and we shall answer.
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